<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .flex {
            width: 700px ;
            border: 1px solid black;
            display: flex;
        }


        .left{
            flex: 1 ;

            padding:15px;
            border-width : 0 ;
        }

    </style>
</head>
<body>
<div class="flex">
    <div class="left">1</div>
    <div class="right ">2</div>
</div>
</body>
</html>
